Technically anything through the 80's is now oldies....That’s safe.
They haven’t been Oldies for ages now.
Oldies is a term for musical genres such as pop music, rock and roll, doo-wop, surf music (broadly characterized as classic rock and pop rock) from the second half of the 20th century, specifically from around the mid-1950s to the 1980s, as well as for a radio format playing this music.